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Shanghai Toko Tech Co., Ltd. is a professional manufacturer and supplier of high-performance special alloy pipes and components. Its ALLOY 625 (UNS N06625) seamless coiled tubing is a nickel-chromium-molybdenum alloy renowned for its exceptional combination of high strength, outstanding corrosion resistance, and excellent fabricability. It is specifically strengthened by the addition of niobium and molybdenum, making it suitable for the most demanding applications across aerospace, marine, and chemical processing industries.
Key Features & Advantages:
- Exceptional Corrosion Resistance: Offers outstanding resistance to a wide range of severe corrosive environments, including pitting, crevice corrosion, and oxidation. Its high molybdenum content provides superior resistance to chloride-ion media.
- High Strength Without Heat Treatment: Achieves high strength and excellent fatigue resistance through the solid-solution strengthening effect of molybdenum and niobium, maintaining good mechanical properties from cryogenic temperatures up to about 1000°C (1800°F).
- Excellent Resistance to Acidic Environments: Demonstrates remarkable resistance to various inorganic acids, including nitric, phosphoric, and sulfuric acids, making it ideal for chemical processing equipment.
- Good Fabricability and Weldability: Can be readily welded and fabricated using standard techniques, and maintains good ductility and toughness after welding.
- Seamless & Continuous Length: The seamless structure ensures maximum integrity for critical high-pressure and high-temperature applications. The long coiled length eliminates potential weak points from welds and simplifies installation in complex systems.
Material Composition (Chemical Requirements per ASTM B444):
The unique properties of ALLOY 625 are derived from its precise chemical composition.
| Element | Content (%) | Role |
| Nickel (Ni) | 58.0 min | Forms the matrix, providing excellent corrosion resistance and high-temperature stability. |
| Chromium (Cr) | 20.0 – 23.0 | Provides resistance to oxidation and high-temperature corrosion. |
| Molybdenum (Mo) | 8.0 – 10.0 | Enhances resistance to pitting and crevice corrosion, and provides solid-solution strength. |
| Niobium (Nb) | 3.15 – 4.15 | Acts with molybdenum to provide strengthening through the formation of stable carbides. |
| Iron (Fe) | 5.0 max | Balances composition and cost. |
| Carbon (C) | 0.10 max | Kept low to minimize carbide precipitation. |
| Manganese (Mn) | 0.50 max | Aids in deoxidation during melting. |
| Silicon (Si) | 0.50 max | Enhances resistance to high-temperature oxidation. |
| Phosphorus (P) | 0.015 max | Impurity, kept low to maintain weldability and toughness. |
| Sulfur (S) | 0.015 max | Impurity, kept very low to prevent hot shortness. |
Typical Specifications (Customizable):
- Material Grade: UNS N06625 / ASTM B444 / W. Nr. 2.4856 / BS3076 NA21 (Inconel 625)
- Outer Diameter (O.D.): φ3.18 mm ~ φ27 mm (Common range for coils)
- Wall Thickness (W.T.): 0.5 mm ~ 2.0 mm (Varies with O.D.)
- Coil Length: Several hundred meters per continuous coil (exact length depends on O.D. and W.T.)
- Standard: ASTM B444, ASTM B705
Primary Applications:
This premium nickel alloy tubing is specified for the most demanding applications across various industries:
- Aerospace Industry: Engine exhaust systems, thrust reversers, and other high-temperature components requiring exceptional strength and corrosion resistance.
- Marine & Offshore: Seawater piping, propeller blades, and submarine components due to its outstanding resistance to seawater corrosion.
- Chemical Processing: Equipment for handling highly corrosive chemicals, especially acids and chlorides, in reactors, heat exchangers, and transfer lines.
- Oil & Gas Production: Downhole instrumentation, control lines, and components in sour (H₂S/CO₂) and high-chloride environments.
- Nuclear Industry: Core components and control rod mechanisms due to its radiation resistance and high integrity.
Why Choose TOKO TECH’s ALLOY 625 Coiled Tubing?
TOKO TECH ensures the highest quality through stringent process control. The manufacturing includes a solution annealing heat treatment at ~1095-1205°C to achieve optimal microstructure and corrosion performance, followed by 100% non-destructive testing (Eddy Current or Ultrasonic). Given its application in extreme environments and its premium nature, coils are typically protected with VCI (Vapor Corrosion Inhibitor) packaging or vacuum sealing to prevent any surface contamination during transit and storage.
In summary, TOKO TECH’s ALLOY 625 (Inconel 625) seamless coiled tubing provides an ultra-reliable, high-strength solution for the most severe corrosive and high-temperature applications. Its unique combination of properties, derived from its precise chemistry, makes it an indispensable material for engineers in the aerospace, marine, chemical processing, and energy industries where performance and reliability are critical.